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Hidden camera (fire sprinkler)

1930 Grinnell Fire Sprinkler

Unusual German fire sprinkler with head cage. (SFH), 1981

1958 fire sprinkler wine stopper I made

Viking fire sprinkler alarm converted to clock

Fire Sprinkler Advertising

How home fire sprinklers work.

Movinkler – Self Adjusting Fire Sprinkler System by Jin seon Lee - A self-adjusting fire sprinkler system that is simpler, smarter, and safer than most existing models. The design features a heat-detection camera and capacity for movement. | Yanko Design